TECHNICAL INFORMATION CENTERIIII~2 ~i 1111 IIIIIWEl IHlUHIIlllIllIlWlUl5 0644 00004896 1

DEPARTMENT OF THE ARMY -7-ABERDEEN PROVING GROUND Mr. Neff/cJg/3937

ABERDEEN PROVING GROUND, MARYLAND 21005

SUBJECT: Final Letter Report on Comparison Test of Truck, Utility, i/4-Ton, 4X4, MI5JA2, USA Reg. No. NBOO4A, Mfg. Serial No. 26801,TECOM Project No. l-VG-120-151067, Report No. APG-M-4341

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Comm ner T M LI LUS Army Tank-Automotive Camand RAWN: AMSTA-QST REFE~iFNj ,E COPyWarren, Michigan 48090r

1. REFERENCES:

a. Letter, TECOM, AMSTE-BB, Customer Test Directive: InspectionComparison Test of Trucks, Utility, i/4-Ton, 4X4, M151A2, TECOM ProjectNo. l-VG-120-151-058/059/060/061/062/063/064/065/066/067/068/069, 27 March1972.

b. AMC Form 1006A, Test Program for Truck, Utility, 1/4-Ton, Con-tract No. DAAE07-71-C-0103, 16 March 1972.

c. TACOM Procurement/Work Directive (AMC Form 1095A), for Truck,i/4-Ton, ABTM151 Series, 3 March 1972.

d. Letter, TACOM, AMSTA-ST, AM General Corporation, Contract DAAEO7-72-C-0103, M151A2 Comparison Test, 22 February 1973.

e. Letter AMSTA-QT, Noise Test, (Piggy Back) TECOM Project No.I-C0-266-000-004, on the Inspection Comparison Test of the M151A2 andM561 Trucks, 8 March 1973.

2. BACKGROUND:

One vehicle, truck, utility, l/4-ton, 4X4, M151A2, US Army Reg. No. NBO4A,produced under contract No. DAAEO7-71-C-0103, was subjected to a 5000-milecomparison test at this installation during the period 24 May to 2 July1973.

The over-all configuration of the M151A2 vehicle is basically the sameas previous models; all models incorporate the product improvements pre-viously evaluated on the M151A2 vehicle. The most significant of the

c)WtZ0 01, 14r1 Reproduced FromBest Available Copy

STEAP-MT-U

SUBJECT: Final Letter Report on Comparison Test of Truck, Utility, 1/4-Ton, 4X4, M15JA2, USA Reg. No. NBOO4A, Mfg. Serial No. 26801,TECOM Project No. 1-VG-120-151-067, Report No. APG-MT-341

product improvements are the 1-piece windshield, deep-dish steering wheel,mechanical fuel pump, and trailing arm rear suspension. The vehicle ispowered by a 4-cylinder, water-cooled, gasoline engine, a 4-speed forwardtransmission, and selective front wheel drive. The body is of unitizedconstruction. The vehicle is designed for use over all types of roads aswell as cross-country terrain, and in all weather conditions.

3. OBJE)IVTE:

The objective was to provide evidence of contractor conformance tospecified sections of MIL-T-OO45331E, 23 January 1970, and related re-quirements as outlined in AMC form 1006A, 16 March 1972.

4. SUN4ARY OF RESULTS:

One M151A2 vehicle, USA Reg. No. NB004A, was received from the contractor'splant, via commercial carrier, on 24 May 1973 in an acceptable conditionin accordance with applicable shipping procedures.

An initial inspection was performed on the vehicle to assure a safe operat-ing condition. All on-equipment materiel (OEM) was inventoried, checkedfor fit, and installed on the vehicle for the duration of the test. Thevehicle was received less the vehicle curtain, folding top, quarter, andback, FSN 2540-064-6587. The shortage of this GFE item was annotated onthe receiving document (DD Form 250), and therefore is not a chargeableshortcoming.

Initial lubrication was performed in accordance with LO 9-2320-218-12.The engine and gear boxes were checked and all lubricant levels were sat-isfactory. All grease fittings were lubricated.

Upon completion of initial inspection and lubrication, five test radialtires and wheels were installed and 100 mile of break-in mileage wasaccomplished. The test tires and wheels were removed and original tiresand wheels reinstalled for the conduct of noise spectra test, Ref. Letter,AMSTA-QST, 8 March 1973,and specified performance tests.

After completion of all performance tests the test tires, and wheels werereinstalled for remainder of test. Remaining break-in mileage (420-miles) "

was accomplished on paved road, at curb weight per instructions containedin TM-9-2320-28-IO. This mileage is included in the total prescribedendurance mileage.

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L ,IiI

STEAP 49-USUBJECT: Final Letter Report on Ccmparison Test of Truck, Utility, 1/4-

Ton, 4X, M151A2, USA Reg. No. EBOOlA, Mfg. Serial No. 26801,TECOM Project No. I-VG-120-151-O67, Report No. APG-Wf-341

The load distribution at curb, with cross-country, and highway payloadswas determined by use of portable scales at each wheel position. Thepayload consisted of sand-filled canvas bags and boxes. Specified cross-country payload was 800 pounds. Specified highway payload was 1200pounds. Load distribution was as shown in Table I.

Table I. Load Distribution

Weight, LB

Ioad Location Curb Cross-Country Highay

Left Front Wheel 696 764 780

Right Front Wheel 630 685 696

Left Rear Wheel 572 933 1894

Right Rear Wheel 561 887 1o68

Total 2459 3269 4438

The prescribed vehicle performance tests were conducted in accordance withspecific paragraphs of MIL-T'-45331E, 23 January 1970, and related re-quirements as outlined in the procurement/work directive. The performancetest results were as shown in Table II.

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STEAP4f-USUJET: Final Letter Report on Couaqrison Test of Truck, Utility, 1/14-

Ton, 14X14, M151A2, USA Beg. No. NBOO0eA, Mfg. Serial No. 26801,,TECMJ Project No. 1-VG-120-151-06T, Report No. APG-ffl-431l

Table II.* Vehicle Performance Tests

Test Requirement Bug Ref Para Results

Engine 4.3.1.1 3.3.1 Satisfactory

Speed Check 4.3.1.3 3.14.5.1 Unsatisfactory8

Turning Ability 4.3.1.5 3-411 Satisfactoryb

Accessories Check 4.3.1.6 3.5 Satisfactory

Servicing and AdjustmentCheck 4.3.1-T 3.6 Satisfactory

Grade Speeds 4.3.2.5 3.14.5.2 Satisfactory-c

Highway and SlopeOperation 4.3.2.6 3.14.6 and Satisfactory

3.14.T

Cross-Country and HighwayOperation 4.3.3.4 3.14.6 thru Satisfactory

3.14.8

Fording Operation 4.3.3.5 3.14.9.2 Satisfactory

Electromaagnetic interferencedCharacteristics 4.3.3.6 3.7T Unsatisfactoryd

sTbe vehicle failed to meet the mxlmun speed criteria of 60 mph,. but metthe minimumn speed criteria of 2-1/2 mph. The maximum speed obtained was56.5 mph, @ 3220 Engine RPM (Ref. Inci 1, Page 1).

blurning radius wan 17.5 both right and left (Ref. Inci 1, Page 1).

O~The 6-1/2% slope is not available at APG; 10% slope speed was 29.5 mphand 60% slope speed was 7.8 mph (Ref. Incl. 1, Page 2).

dThe radiated. and conducted electcanagnetic emissions from the test itemexceeded the specified a11oviable limits of MIL-ST-461A for class inAEquipment over the frequency ranges where tests were perf ormed.

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STEAP-M]-USUBJECT: Final Letter Report on Camparison Test of Truck, Utility, 1/4-

Ton, 4A, ?151A2, USA Reg. No. IBOOiA, Mfg. Serial No. 26801,TECOM Project No. l-VG-120-151-067, Report No. APG-MT-4341

Frequencies and amplitudes where the test item failed are given in Inclo-sure 1, Pages 4 thru 25.

The vehicle was subjected to and satisfactorily ccmpleted the 5000-mileendurance test which included 500 miles of break-in operation on pavedroad at curb weight. The remaining 4500 miles were completed in two cyclesas shown in Table III. The first cycle was accomplished with a towed load.

Table III. Endurance Test Mileage

Mileage

Course Payload Towed Loada Specified Actual

Paved (Break-In) None None 500 520

Paved (Highway) 1179 1320 1000 982

Gravel 810 1070 425 435

Belgian Block and Gravelb 810 1070 375 363

Level Cross-Country 810 1070 700 700

Hilly Cross-Country 810 1070 800 800

Secondary Road "A" 810 1070 1200 1200

Total 5000 5000

aFirst cycle only.

b6Yv Gravel and 0% Belgian Block.

Three significant incidents were experienced during the endurance test.The lower right front suspension arm rear mounting cap screw loosened, re-sulting in the loss of one shim. The shim was replaced and all mountingcap screws were retorqued as prescribed in T4-9-2320-218-34 (Ref. Incl 2,Page 1). The upper radiator insulator assembly fractured through thefront mounting screw; the insulator assembly was replaced (Ref. Incl 2,Page 2) and the right rear outboard suspension arm bushing was worn andreplacement was necessary after 3000 test miles (Ref. Incl 2, Page 2).The vehicle was forded in 21 inches of water, without incident, upon com-pletion of the test miles.

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STEAP41T-USUBJECT: Final Letter Report on Comparison Test of Truck, Utility, 1/4-

Ton, 4X4, M151A2, TA Reg. No. NBO01 A, Mfg. Serial No. 26801,TECCM Project No. l-VG-120-151-067, Report No. APG-T-434J

Fuel consumption data are included in Inclosure 1, Page 26.

Upon completion of all testing a final inspection of the vehicle was per-formed. A limited teardown and inspection of the engine, power train,brake, suspension, and electrical systems was accanplished. The radialtest tires and wheels were removed fron the vehicle and original tiresand wheels reinstalled on the vehicle. The test tires and wheels arestored in the warehouse awaiting instruction fron AMSTA-RKW.

No significant incidents were experienced as the result of final inspec-tion.

The vehicle was restored to code "B" condition, given a technical inspec-tion, painted, lubricated, and returned to supply channels.

5. CONCLUSIONS:

It is concluded that:

a. Quality of workmanship at the time of manufacture was satisfact-ory.

b. Vehicle performance requirements were met with the exception ofmaximum speed and radio interference suppression requirements within thefrequency spectrum tested.

c. Vehicle endurance was satisfactory, except the lower right frontsuspension arm cap screws loosened, the upper radiator insulator assemblyfractured, and the right rear outboard suspension arm bushing was worn.

FOR THE OMMANIER:

2 Ind H. A.BE1. Test Data Acting Associate Director2. Deficiencies and Shortcomings Materiel Testing Directorate

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STEAP49-USUBJECT: Final Letter Report on Comparison Test of Truck, Utility, 1/-

Ton, 4X4, M151A2, USA Reg. No. NB001 IA, Mfg. Serial No. 26801,TECO4 Project No. 1-VG-120-151-067, Report No. APG-T-43I3

Copies Furnished:Cdr, TECOM, APG, MD. 21005, ATTN: AMSTE-1B (2 cys)Cdr, TACOM, Warren, Mich. 48090

ATTN: AMSTA-QST (2 cys)AMSTA-QKT (1 cy)AMSTA-W (1 cy)AMSTA-QE (20 cys)AMSTA-EPT (1 cy)AMSTA-QC (1 cy)AMSTA-4 (1 cy)

Chief, DCASO, South Bend, 2015 Western Ave., South Bend, Ind. 46621ATTN: DCRI-DIGS-C (6 cys)

Dir, DCASR, Chicago, O'Hare International Airport, P. 0. Box 66475,Chicago, Ill. 60666, ATTN: DCRI-FCM (1 cy)

AM General Corp., 701 W. Chippewa Ave., South Bend, Ind. 46623ATTN: Mr. Yeakey (QA),

Cdr, APG, MD. 21005ATTN: STEAP-TL (1)

STEAP-T-U (8 cys)SMP-MT -X (1 C)

Cdr, DDC, Alexandria, VA. 22314, ATTN: Docu Svc Cntr (2 cys)

Secondary distribution is controlled by the US Army 'Tank-AutomotiveCommand, ATTN: AMSTA-QST

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TEST DATA

The M151A2 truck was tested in conformance to MIL-T-0045331E, 23 January1970.

Test Requirements Results

Engine Paragraph 3.3.1. The engine Satisfactory.shall conform to MIL-E-0045332,except that the section cover-ing preparation for deliveryshall not apply. The vehicleshall meet all performancerequirements specified hereinwith the engine installed.

Speed Check Paragraph 3.4.5.1. The M151A2 Unsatisfactory: Max-trucks, including cross-country imum speed, 56.5 mph;towed load, shall sustain a minimum speed 2.5 mph.speed of not less than 60mph. The M718AI and M825vehicles, including cross-country payload, shall sustaina speed of not less than 60mph and 50 mph, respectively.All vehicles shall sustain alow speed of not more than 2-1/2mph in low gear, when operatedon smooth, dry, relativelylevel, hard-surfaced roads.Drumming, shimmy, or tramp-ing shall not occur through-out any speed range.

Turning Ability Paragraph 3.4.11. The vehicle Satisfactory: 17.5 feetshall demonstrate a maximum both right and left.turning radius of 18.5 feet,measured from the centerlineof the outside front wheel,when completing full turns toright and left.

Accessories Check Paragraph 3.5. Horn, wind- Satisfactory.shield wipers, windshieldwashers, lights, turn signalsand hazard warning lights,sending units, gages and otherinstruments, switches, andcontrols shall perform theirintended use.

Inclosure 1, Page 1

Test Requirements Results

Servicing and Paragraph 3.6. Prior to Satisfactory.Adjustment Check delivery, the contractor shall

service the vehicle for opera-tional use. Servicing andadjustment shall result invehicle demonstrating perform-anee in accordance withrequirements of this specifi-cation. Engine cooling systemshall be serviced with a solu-

tion of ethylene glycol con-forming to type I of 0-A-548and water, in equal parts byvolume.

Grade Speeds Paragraph 3.4.5.2. The truck, Satisfactory.including cross-country pay-load and with cross-countrytowed load when applicable,shall ascend and descend gradesup to 6-1/2% at a speed of 30mph, when operated on smooth,dry, hard-surfaced roads.Without towed load, the M151A2and MTl8AI, including cross-country payload, shall ascendand descend grades up to 60% ata speed of 2-1/2 mph, whenoperated on smooth, dry, hard-surfaced roads. Without towedload, but including cross-countrypayload, the M825 shall ascendand descend grades up to 50%at a speed of 2-1/2 mph whenoperating on smooth, dry,hard-surfaced roads.

Highway and Paragraph 3.4.6. The truck Satisfactory.Slope Operation shall transport highway pay-

loads, while towing highwayloads, when operated on smooth,dry, relatively level, hard-surfaced roads.

Paragraph 3.4.7. The M151A2 Satisfactory.and M718AI trucks, includingcross-country payload, shalloperate on side slopes of up

PPage 2

Test Requirements Results

to 40,, and the M825 truck,incling cross-country pay-load, on side slopes up to30%, sloping right or left.

Cross-Country Paragraph 3.4.8. The trucks Satisfactory.Operation shall transport cross-country

payloads, while towing cross-country loads when applicable,on unimproved roads, trails,and open terrain.

Fording Operation Paragraph 3.4.9.2. The vehi- Satisfactory.cle, without fording equipmentor modification and with ratedcross-country payload andtowed load when applicable,shall ford a hard-bottmned,relatively level crossing infresh or salt water to a depthof at least 21 inches.

Electrcmagnetic Paragraph 3.7. The vehicle Unsatisfactory. TheInterference shall conform to the electro- vehicle failed toCharacteristics magnetic interference charac- conform to the elec-

teristics requirements for trmagnetic interfer-tactical equipment, class IIIA ence characteristicof MIL-STD-461. for tactical equip-

ment, class IIIA ofMIL-STD-461A. Testresults are presentedin Inclosure 1, Pages4 through 25.

1Page 3

EIBC1aRQAGNNUICINEFRNEVAUTO

1. OBJECTIVE

To measure and determine if the radiated and conducted electromagneticinterference (DII) emission levels from the Truck, Utility, 1/ Ton,4X4, Model K151A2, Serial No. NBOA-26801, USA Reg No. NB004A, and itselectrical accessories are within the specified allowable limits ofMIL-STD-461A for Class IIIa equipment.

2. CRITERIA

Radiated and conducted DII emissions from the complete vehicle includingits electrical accessories shall not exceed the specified allowablelimits of MIL-STD-61A for Class IIIa equipment.

3. MM'OD

Spectrum Surveillance System Model FSS-250D, Serial No. 33, is used tocollect and record the radiated and conducted 1I emission measurements.

A list of associated ancillary equipment used in conjunction with theSpectrum Surveillance System FSS-250D is give in Inclosure I.

The radiated emission subtests are performed in accordance with themethods for Subtest REO5 outlined in NIIrSTD-h62 over the frequency rangefrom 150 klz to 1000 MHz. The antennas are individually oriented one meterabove ground level and one meter from the front, left and right sidesof the vehicle engine compartment. The Biconical Antenna BIA-25 IGalternately polarized horizontally and vertically to obtain measurementsover the frequency range from 25 to 200 MHz.

The conducted emission subtests are performed in accordance with themethods for Subtest CE03 outlined in MIL-STD-462 over the frequencyrange from 150 kHz to 50 MHz. The Current Probe PCL-25 is clamped alter-nately around the positive (+) and negative (-) power cables at thevehicle battery.

Operation of the test vehicle during simultaneous operation of one ormore of the electrical subsystem during the radiated and conducted DIemission subtests is established as shown in Table I.

1Page 4

?.A3L3 I

Special Operating Conditions

Mode Test Condition

1 Ignition and battery charging systems operatingwith headlights energized (engine speed - 700rpm, slow idle)

2 Ignition and battery charging systems operatingwith headlights energized (engine speed - 1200rpm, fast idle)

3 Windshield viper motor energized (high speed)

4 Directional signal/4-way flasher systemenergized (l-vay operation)

5 Horn assembly energized - horn relay actuatedapproximately 60 times per minute (60 cs)

Radiated and conducted 21 emission subtests of the ignition and batterycharging systems are made ith the vehicle engine operating at slow idle(TOO rpm) and fast idle (1200 rpm) ith headlights energized to providesome electrical loading.

Radiated and conducted B4 emission subtests of the windshield viper motor,directional signal/4-way flasher and electric horn assembly relay aremade with the vehicle engine inoperative. The electric horn assembly relayis actuated approximately 60 times per minute to obtain measurements ofswitching transients, if any.

A list of the potential sources of M and their respective manfacturer'snomenclature is given in Inclosure I.

l4. RESUMfS

The subject vehicle failed the radiated and conducted EMI emissionsubtests RE05 and CE03, MIL-STD-461A for Class Ila equipment.

A suamry of the radiated and conducted RU emission subtest results forthe complete vehicle and individual accessories are given in Table II.

1Page 5

TANA IIRadiated and Conducted Ia 1mission Results

Bad Emission (R w5) Cond Alussion (Cuo3)Item/Accssory DesC. Passed Failed Passed Failed

m f5A2 Truck X X

Iga & Batt Chg Sys (slowidle 700 rpm) Mode 1 X X

ag & Ihtt Oig Sys (fastidle 1200 rpm) Mode 2 X X

Windshield Wiper MotorMode 3 X X

Dir sig/4-way FlasherMode 4 X X

Horn Assembly (Switching)

Mode 5* X X

*Electric horn operated ON/OFF (60 times per minute)

Radiated Eaissions, Subtest REOB5 - Frequency range, 150 kHz to 100 MHz.Radiated XMI emissions from the ignition and battery charging systems,windshield wiper motor and directional signal/4-way flasher were withinthe allowable limits of the governing specification. However radiatedEMI emissions from the electric horn assembly (switching CU/OFF) exceededthe allowable limits of the governing specification. Radiated EMIemission measurements could not be made over the frequency ranges from150 kHz to 21.5 MHz because of excessively high RF ambient noise levels,0-42 db above specification limits, with exception of the radiated emissionsubtests of the electric horn assembly. It was possible to masure theradiated emissions from the electric horn assembly above the RF ambientsbecause the magnitude of these emissions exceeded the R? ambieat noiselevel. Susiary tabulations of the radiated EMI emission accessory failures(Subtest RE05) are shown in Table In.

1Page 6

2ALE IIBaAted Da Biasion Accessory Failures

M-sD- lA (PO5) - 156 kiz - 1ooo Mz

Freq Range Db Above Ant. (25-200 MHz)Sys/Acces. Desc. (NHz) Spec Limit Loc/Polar

• Hora Assembly (Switching)Mode 5 1.65-8oo o-4o F V

*Horn Assembly (Switching)Mode 5 25-200 0-30 F H

*Horn Assembly (Switching)Mode 5 2.5-880 0-37 L V

*Horn Assembly (Switching)Mode 5 25-200 0-33 L H

*Horn Assembly (Switching)Mode 5 2.5-750 0-26 R V

Horn Assembly (Switching)

Mode 5 25-200 0-25 R H

Legend:

F - Front of vehicleL - Left side of vehicle engine compartmentR - Right side of vehicle engine compartmentV - BIA-25 Biconical Antenna vertically polarized (25-200 MHz)H - BIA-25 Biconical Antenna horizontally polarized (25-200 MHz)Mode 5 - Ref Table I

*Electric horn assembly operated ON/OFF (60 cpm)

Graphic presentation of the radiated EMI emission accessory failures(Subtest RE05) is given in Appendix I. Graphic presentation of a typicalRF ambient noise level recorded during radiated EDI emission testing isshown in Inclosure 1-9.

Conducted Emissions, Subtest CE03 - Frequency range, 150 kHz to 50 MHz.Conducted Ma emissions from the ignition system and electric windshieldwiper motor were withir the allowable limits of the governing specification.Conducted I emissions from the battery charging system at both slow andfast engine idle and from the directional signal/4-way flasher system and

1Page 7

electric horn assembly exceeded the allowable limits of the governingspecification. Summary tabulations of the conducted EMI emission accessoryfailures (Subtest CE03) are shown in Table IV below:

TABLE IVConducted EMI Emission Accessory Failures

Freq Range Db Above BatterySys/Acces. Desc. (MHz) Spec Limit Cable

Ign & Batt Chg Sys 0.15-1.6 0-20 P(slow idle) Mode 1 0.15-1.6 0-20 N

Ign & Batt Chg Sys 0.15-1.4 0-26 P(fast idle) Mode 2 0.15-1.4 0-26 N

Dir Sig/4-Way Flasher 0.15-1.5 0-32 PMode 4 0.15-1.4 0-33 N

*Horn Assembly 0.15-0.22 0-18 P(Switching) Mode 5 0.42-50 0-52 P

0.15-0.22 0-17 N0.32-50 0-65 N

Legend:

Modes 1 thru 5 - Ref Table IP - Positive battery cableN - Negative battery cable

*Electric horn assembly operated ON/OFF (60 cpm)

Graphic presentation of the conducted EMI emission accessory failures(Subtest CE03) is given in Inclosure 1.

5. ANALYSIS

Although other accessories and/or subsystems failed the radiated and/orconducted EMI emission subtests, the electric horn assembly appeared tobe a commercially available off-the-shelf item. It contained no apparentRF interference suppression treatment.

Although the vehicle ignition and battery charging systems were operatingsimultaneously during performance of radiated and conducted emission testsof these accessories, it was quite evident by the nature of the emissionsmeasured that they were being produced by the battery charging system.

1Page 8

Radiated and conducted emission results obtained during conduct of thetests herein contained are comparable with those obtained during previoustests of the M151A2 Utility Trucks.

POTENTIAL SOURCES OF EMI TO BE EVALUATED

Truck, Utility, 1/4 Ton, 4X4, M151A2, AM General Corp, S/N NBO04A-26801(252 miles at end of test)

1. Engine AM General Corp Model M151 series, 141.5 ClD, 4 cylinder liquidcooled, gasoline, S/N 5018019, Ord Part No. 11613729

a. Ignitor (combination coil-distributor) - Prestolite Model IDA-4402UT,28 volt, S/N 2F916919, OrdPart No. 11660529

b. High Tension Ignition Leads (4) - Woven metallic hose shielding

c. Spark Plugs (4) - Shielded and suppressed Mil Std type

d. Alternator - Prestolite Model AMA-5102UT, 28 volt, 60 amp, 10,000rpm, S/N 4F001297, MIL-G-46795

2. Windshield Wiper Motor (Electric) - Prestolite Model ETU 5001UT, 24 volt,US Part No. 11644874, F3, 052629

3. Directional Signal/4-Way Flasher System - Swiss Controls & Research

a. Control Assembly Directional Signal - US Part No. 11613632, 24 volt,S/N 1931-3090090, FSN 2590-808-6072

b. Flasher Directional Signal - US Part No. 11613631, 24 volt, S/N 1780-3090157, FSN 5945-789-3706

4. Horn, Electric, Automotive - Sparton Corp No. 14S-50M-C, Mfg Part No.MS-51074-1

1Page 9

LIST OF INSTRUMENTATION AND FACILITIES

1. Spectrum Surveillance System Model FSS-250D, S/N 33 - Calibration DueDate: 25 July 1973; Accuracy: Frequency ±2%, Amplitude ±2db

2. Ancillary equipment for radiated emissions (RE05) - 150 kHz to 1000 MHz

a. Antenna, Whip - RVR-25 (14 kHz to 25 MHz)

b. Antenna, Biconical - BIA-25 (20 to 200 MHz)

c. Antenna, Log Spiral - LCA-25 (200 to 1000 MHz)

3. Ancillary equipment for conducted emissions (CE03) - 150 kHz to 50-MHz

Current Probe - PCL-25 (14 kHz to 50 MHz)

1Page 10

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Fuel Consumption Average By Course, Vehicle No. NBO04A

Avg. Miles Avv. MilesSpeed, Per Speed, Per

Course MPH Gallon MPH Gallon

Paved (Break-in) 28.5 24.8

Paved 38.6 21.9 36.9 16.4

Gravel 34.8 18.3 34.6 18.5

Belgian Block and Gravel 28.7 15.6 26.1 7.7

Hilly Cross-country 26.1 12.1 20.7 9.7

Level Cross-country 28.1 16.9 28.7 14.0

Secondary Road "A" 30.7 19.2 26.9 16.9

Total Average 31.2 17.3 28.9 15.4

1Page 26

DEFICIENCIES AND SHORTCONINGS

1. DeficienciesNone

2. Shortcomings

Suggested CorrectiveShortcoming Action Remarks

2.1 Maximum Road The maximum speedspeed cannot be obtained with cross-met. country payload and

towed load was 56.5mph or 3.5 mph lessthan specified

2.2 Radio frequency The vehicle failedinterference supp- to meet specifiedression requirements requirements ofcannot be met because MIL-STD- 461.electromagnetic emmissionsexceed the allowablelimits.

2.3 The rear mounting The mounting shim wascapscrews of the lower replaced to restoreright front suspension front wheel alignment

arm loosen at rear and the mountingmounting shim. capscrews torqued as

prescribed inT149-2320 218-34.

2.4 The upper The mounting insulatorradiator insulator was replaced.assembly fracturesthrough the frontmounting screw after2410-test miles.

2.5 The right rear The bushing rubberoutboard suspension segment had completelyarm bushing is worn disintegrated. Theafter 3000-test miles. bushing was replaced.

Inclosure 2, nape 1

UnclassifiedSecurity Classification

DOCUMENT CONTROL DATA - R & D -(Security classification of title. body of abstract and indexing annotation must be entered when the overall report to claseified)

I. ORIGINATING ACTIVITY (Corporate *Uthor) Ia. REPORT SECURITY CLASSIFICATION

Materiel Testing Directorate UnclassifiedAberdeen Proving Ground, Maryland 21005 2b. GROUP

3- REPORT TITLE

Comparison Test of Truck, Utility, 1/4-Ton, 4X4, M151A2, USA Reg No. fB004AMfg Serial No. 26801.

4. DESCRIPTIVE NOTES (Type ol report and Inclusive dates)

Final Letter Report, 24 May to 2 July 1973.S. AUTHOR(S) (First name, middle initial, last name)

W. H. Neff, Jr.

6. REPORT DATE 7a. TOTAL NO. OF PAGES j 0b. NO. OF REFS

July 1973 36 I8. CONTRACT OR GRANT NO. Sa.IORIGINATOR'S REPORT NUMERIS

IWE07-71-C-0103b. PROJECT NO. APG MT-43liTECCII Project No. 1 VG-120 151-067

Csb, OTHER REPORT NO(S) (Any other n mbers that may be assigned

this report)

10. DISTRIBUTION STATEMENT

Distribution limited to U. S. Government Agencies only; Test and Evaluation;other requests for this document must be referred to Commnder, US ArmyTank-Automotive Comand, ATTN: AM -QST

II- SUPPLEMENTARY NOTES 12. SPONSORING MILITARY ACTIVITY

None TAC(]

13. ABSTRACT

A comparison test of one truck, utility, i/-ton, xk, M151A2, was conducted by theMateriel Testing Directorate at Aberdeen Proving Ground from 24 May to 2 July 1973.Testing vas conducted in accordance with military specification NIL-T-0045331E.Quality of workmnship at the time of manufacture was satisfactory. Vehicleperfolnnce requirements vere met with the exception of radio interference suppressionand maximum speed requirements. Vehicle endurance was satisfactory, except thelower right front suspension arm capserews Icosened, the upper radiator insulatorassembly fractured, and the right rear outboard suspension arm bushing was worn.

row KA9aRPLACE9S 00 FORM 1473. 1 JAN 5.WHIC1 IDD I- 10V41473 8OT&FRAMU9t, wOV euI ~ OUSOLETE Fron AMy US.o eUnclassified

Security Classification

UnclassifiedSecurity Classification

4. LINK A LINK B LINK CKIEV WORDS ROLE WT ROLE Wi' ROLE WT

Truck, utility, 1/-ton, X4, K151A2Quality assurancePerformnceEndurance

Unclassifiedsecurity Classificetion